The Dark Side ain't a one and done deal. It's a daily struggle.
Delving into medieval European history for a bit... We in the modern era have seriously fallen victim to a centuries-old game of Telephone regarding the "Holy Grail". The accepted notion that it's the cup that holds *****' blood of everlasting life is from later misinterpretations of the earliest Grail stories. Those were originally from a couple Templars -- one German, one French. But in both cases, the Grail isn't a physical object -- it's a discipline, a way of life. It's the striven-for dedication of the Holy Knight to be mindful of himself, of the temptations and distractions the world throws at us, and the ongoing process of re-dedication to the Grail -- a Teutonic word meaning line or path. In a roundabout way, it's where we get the more contemporary saying "walking the straight and narrow".
There's much in Star Wars that draws from this. Including the above. Once a Padawan or other initiate into the Mysteries of the Force becomes aware of Ashla and Bogan, they must learn to be mindful of the presence and influence of each in themselves and work to not skew too far off the balance point.
Unfortunately, Lucas forgot all that when he decreed that the Light Side is the true aspect of the Force, with the Dark Side being a warped corruption, and that the Force being in "balance" means -- a fairly
unbalanced -- no Dark Side. But the teachings of Obi-Wan, Yoda, and Qui-Gon throughout the OT and PT focus on meditation, self-knowledge, opening up one's awareness to the universe, passivity, calmness... Recognizing emotion, but not letting it drive one. Instinct without attachment. I like to call that the Jedi Grail. Alas, long forgotten by most by the time of the films. At the risk of dancing near the subject of contemporary politics, they've spent the last 4,000 years very determinedly
not being Sith, while, over the same span, the Sith have dedicated themselves to
not being Jedi. To the point that that could be used to describe each sect. "Sith: Not Jedi". That kind of extreme polarization is both unhealthy and unsustainable.
I'd argue that what Luke was probably originally looking for with Ben, what tacitly maybe got passed on to Rey, is some first-sources Jedi teachings that date from before all of that sectarian strife, when the Jedi were more balanced in themselves and the galaxy wasn't pinging between one extreme and the other.
[Rey's] story is going to be about redeeming Ben Solo
I hope not. If that
is the direction they go, they're goingg to
have to address the fate that Vader dodged by dying right after
his reversion to the Light: How does someone steeped in so much blood atone for it to the satisfaction of the galaxy his actions have harmed?
View attachment 850921
Note the extra symbol in the middle.
Intriguing. I'm used to seeing those on the outside of the circle:
View attachment 851356
(I've considered that, for the last eight years, since it came out, indicative of the primordial Jedi Order sigil prior to the Schisms that led to the Jedi keeping the winged sword motif and the Sith taking the spiked ring.)
Plus, after Rebels, I can't help but wonder if that symbol "in the middle" is, indeed, The One In The Middle...
Cherry picking from licensed fan fiction is a flawed argument.
First of all, I gotta raise an eyebrow at the dismissive tone of that terminology. Like it or don't like it, everything submitted had to go past editors to get published. Yeah, early-early, things were a lot more lax as far as what made it in, but at least by the late '80s, the publishers were doing their best to enforce consistency, continuity, and verisimilitude (i.e., "Swarziness"). Not going to get into how well they succeeded or how badly they failed as gatekeepers. The dropped balls are why the Story Group was created in the first place, after all. But it's a
hell of a lot more than "fan fiction" (even when there are obvious Gary-Stu characters and such).
Anyway. You were saying...?
It does not exist as canon within the time span of the entire saga. Where as "for over a thousand generations, the Jedi Knights were the guardians of peace and justice in the old republic" is a direct quote from A New Hope, which is canon.
If you think Legends counts as part of the story, how come Chewie ain't dead? Where's Mara Jade? Where is Ben/Jacen Solo's twin sister or younger brother. Why isn't Corran Horn the best pilot in the resistance? Oh, and the lightsaber was retrieved by Jorus C'Baoth for the purpose of cloning Luke from his severed hand............I could go on indefinitely.
Tidying up some points here. The shift in 2014 as far as the nature of the EU was a very subtle one, from "tacitly canon until it isn't" (i.e., since George doesn't pay much attention ti it, he could blithely overwrite anything at any point without notice) to "tacitly not canon until it is". There have already been many references in the new canon to a lot of the stuff from the end of ROTJ all the way back in the EU. Those of us who pay attention to such minutiæ are
pretty sure stuff from the KOTOR era is going to be largely unaffected. Stuff ancillary to things we saw in Clone Wars and Rebels regarding Mandalore reinforce a lot of their role vis-à-vis the Republic and the reorganization of things a thousand years before the films. So, except for things that are directly contradicted or overwritten by the films and series and new-canon books and comics, everything up until ROTJ in the EU is generally safe-ish.
Your examples above are all from the post-ROTJ period, which they deliberately and drastically wiped to start fresh. Mara might very well be out there somewhere -- she just ain't with Luke. Corran might very well be out there somewhere. He didn't join the Rebellion/Republic until after ROTJ. Heck, he might even have been one of the best pilots in the new Republic Navy -- maybe even turned to Luke to train him in the Jedi arts. But by the time the Resistance is formed, he'd be in his 40s. If he stayed with the Republic, he'd've died in the Hosnian system. He might be somewhere in the Resistance that we haven't seen. Resistance and the opening of TFA both show that Leia's hotshot pilots get sent out on special missions... *shrug* But we've known since 2014 that this new post-ROTJ period is
not going to follow the previously-established EU version of events. And I'm fine with that. There's enough "certain point of view" stuff in that period, I can gleefully work with it.
The story was never meant to be expanded beyond the rise and fall of Darth Vader.
And it wasn't even supposed to be
that until around 1995.
I can't speak for everyone, but I am not asking for a whole movie trilogy, a single movie, or even a significant amount of time dedicated to Snoke's origin. I would have been perfectly fine with a single paragraph, like Tarkin spoke of the Emperor in ANH. TLJ is the longest SW movie to date, no reason they couldn't have said something.
We didn't need to know about Palpatine's deep past. His part of the story is being the Emperor and in the PT how he got there. That is more than adequate coverage of that character.
Snoke has somehow managed to cultivate an organization that dwarfs the Empire in it's scope, power, and ability. That deserves some explanation.
Okay. Explanation forthcoming: The First Order isn't that big. Nowhere
near the scope, power, or ability of the Empire. The Empire got going with the full resources of the Galactic Republic behind it. The First Order grew out of Palpatine's contingency plans. It got started not too long after the Battle of Jakku, and undisclosed resources were already in place in the Unknown Regions for those fleeing the fall of the Empire to meet up with, consolidate, and move forward their plans. Over a quarter-century, they have built some ships -- but not the thousands the Empire had, trained many soldiers -- but not the many millions the Empire had, and had been covertly seeking support within known space. By the time of TFA, many ostensibly Republic worlds who miss the "good old days" under the Empire have been funneling support to the First Order.
When and how Snoke got involved in all this is as yet unknown. As unknown as Palpatine's homeworld was in 1980. There's a little bit out there currently that indicates he and Palpatine had some sort of rivalry and Snoke, basically, lost. Not sure if he was exiled or if he fled to the Unknown Regions. He might have been set up in place by Palpatine in the event this day came. He might have been out there and, in Palpatine's absence, was able to take advantage and take over.
At this point in the OT narrative, we knew there was an Empire, thus an Emperor was implicit. He was spoken to have dissolved the Senate and conferred governance directly to the regional Moffs. He looked old and spooky in the larger-than-life hologram conversation he had with Vader. I remember speculation as to whether that was really the Emperor or a Wizard of Oz style simulacrum. Vader addressed him as "Master", but sought to overthrow him with the help of his son. Thanks to the Star Wars novelization, we knew his name was Palpatine. And that's pretty much it. So, so far, I'm seeing a parity. For that matter, the Prequels didn't go into how the Republic formed or how Vallorum got elected or the inner workings of Naboo's weird political/governmental structure, etc.
Rey is the protagonist. Traditional storytelling gives us a reasonable expectation that we should know more about her origins. It's not like mysterious protagonists are the norm and we are being unusually demanding. We knew way more about Luke by the end of ANH and definitely by the end of ESB and Kylo Ren in the ST.
Unlike Luke, we can't even name either of Rey's parents, let alone any more specifics about them. Outside of what Kylo Ren claimed, which is unreliable information at best.
Let's see... First of all, we didn't get Luke's father's name until ROTJ, so we're not to that point in the story yet.

We knew that he was being raised by his aunt and uncle, so presumably his parents were dead. From dialogue, it's apparent he's been with his aunt and uncle for the entirety of his conscious memory. We know zilch about his mom until ROTJ, so it's not relevant here. First we find out that his father was a Jedi Knight like Ben Kenobi, rather than his uncle's fiction. Then, in the next film, Vader tells him
he's his father. We had to wait three years to discover whether that was truth or manipulative lie. Heck, even James Earl Jones didn't believe it at the time.
As for Ben Solo? Let's see. He was born about a year after ROTJ... At some point he started being trained in the Jedi arts by his uncle Luke. Nothing else for the better part of two decades. As of about five years before TFA he and Luke were off in the Unknown Regions and out of communciations range looking for something as yet undisclosed (though we have our suspicions). Leia's true paternity went public and became a scandal, she quit the Republic senate and formed the Resistance because no one would listen to her warnings about this new faction starting to make inroads from the fringes of known space. We don't know yet how Ben reacted to all this when he and Luke got back. It is implied that Snoke somehow got his hooks into Kylo, probably while they were out there in the Unknown Regions. At any rate, Snoke was nudging Ben toward the Dark Side, Luke felt it, had his moment of crisis and couldn't walk it back in time, and Ben trashed everything Luke had built. He changed his name to Kylo Ren and Snoke gave him command of the as-yet-still-vague Knights of Ren (possibly some or all of those students he took with him when he left the burning wreckage of Luke's academy).
Rey, meanwhile, had been living as a junk scavenger on Jakku for a decade near one of Palpatine's Force-nexus "Observatories". She was left there as a child in the "care" of Unkar Plutt. It isn't clear when she struck out on her own, but I doubt she's been living in that AT-AT the whole time. Her mother told her she'd be back to get her before she flew off in that ship. Over the intervening years, Rey's learned to fend for herself, understand droidspeak, learn the languages spoken in and around Niima Outpost, and pilot speeders, freighters, and tugs, at least. She's had dreams of an island that she doesn't understand. Her "revelation" about her parents in the cave on Ahch-To might be the literal truth, but I feel that the story about her parents selling her for drinking money and being buried in paupers' graves on Jakku is paranoia born out of her feeling of abandonment, and Kylo just picked up on that. We'll have to wait and see. Same as with "Is Vader
really Luke's father?"
Really, we know about the same about all of them, to one degree or another.
Plus why introduce the Jedi Books and why would Luke not have read them?
Introduced so Rey could take them and -- presumably -- study them between films or in Episode IX. As for the other... Luke didn't find that planet til after that disastrous night with Ben, else Ben would know where to find him. By the time he
did find Ahch-To, he was wracked with the guilt of his failure and wanting to just run away from it all. The brutal irony of it is that he finally found what he'd been looking for with Ben, but because of what happened, he couldn't bring himself to crack open the texts. He was afraid of what might happen -- that maybe he'd be tempted to re-engage with the Force and with life and with the outer galaxy again.
By that logic then why bother doing anything at all if the Force controls everything.
"You mean it controls your actions?"
"Partially -- but it also obeys your commands."
...And...
"But how will I know?"
"You will
know. When you are calm. At peace. Passive."
...And...
(of midi-chlorians) "They continually speak to you, telling you the will of the Force."
"They do?"
"When you learn to quiet your mind, you will hear them speaking to you."
The gist is one of it being a subtle pressure on th elevel of instinct that one is open and receptive to if one is able to quiet one's mind and feel it. With the added implication of the individual having final say as to whether to go with the nudge or resist it. It's not an all-or-nothing "let go and leave everything to the Force" or "it's only conscious wielding of the Force by the individual" thing.